Within the Ingleborough National Nature Reserve, the transect goes across Scar Close, an area of sparsely wooded limestone pavement supporting a wide diversity of calcareous grassland species. The site is unique in having areas of peat on the pavement that support more acidic tolerant species. The transect was established primarily for Northern Brown Argus but in recent years has had a large colony of Dark Green Fritillary. The discovery of Small Pearl- bordered Fritillary in 2007 highlights the importance of the transect monitoring approach for some of the key butterfly species in the upland

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